The Hardin-type calibration procedure
is more complex due to the inherent partial fixed configuration of the drive
system which is required to allows anisotropic resonance to occur. Thank
you to H. Li, H. He and K. Senetakis for publishing their extremely interesting
and informative work.
“Calibration exercise of a Hardin-type resonant column”,
Li, H. et al. (2018). Géotechnique 68, No. 2, 171-176.
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